I was wondering if anyone could help me figure out when to expect my next period.

I used to be very irregular and then lost a good deal of weight and my periods normalized. I tracked them for a year and they were pretty consistent give or take a few days (around 33 CD mark).

This period, though, I seem to have skipped. I never felt any of my normal symptoms the days leading up to when I would usually start. I am on CD 45 and no signs yet. I got a negative home pregnancy test but my cycle never showed so I went to my GP a few days ago. He gave me another pregnancy test and it was negative, but he detected that I had a bladder infection. I've been on an antibiotic for it since. He also sent off some preliminary bloodwork and a referal to check for PCOS given a few other symptoms I presented with.

That said, is there any way to predict when my period will show up or will I be "pleasantly" surprised?